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Use `rem` for Global Sizing; Use `em` for Local Sizing

Richard Rutter’s guide for setting the font-size of an element is interesting: he argues that we should use both em and rem units depending on the relationship it might have with other elements on the page:

Take the example of a pull quote containing two short paragraphs. The spacing between the paragraphs will depend on the size of the paragraph text, so you could feasibly set that spacing in either rems or ems. Should you decide during your design process

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